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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137382136099cc1f193437e024ac0e89a029f554d22d5d5d11fa67be180889eb' 
  AND token = '5fRXAoMeIZ9+u0SEbCM/bRND04EejFR/ByIjX/wUPOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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