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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe96a82f3be2441e2e7fa3fb73f91dd838b1a696774c01c826a8ec13c3e3ea00' 
  AND token = '44pCt9evoDuQxUHOf8ISpqoV/Pj8CHuK31xXFta4iy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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