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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12dc3f1bf6cf69396e0775a508c68f302c800cf6f4fb56183a3dcb6eecca9239' 
  AND token = 'xRx1BelwjspC4dFK3OjlH4sHbc8Fy7h5Jk6+ttNDveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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