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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea128e3768eef2493714e7ddd83497200de2b24302ed296c385336e2fecba47c' 
  AND token = 'vx9wkwV9xJz5CXK4PAaiGvu1Imh2QbJeqpVjHL9J2Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}