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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ae2762da1f784f5dec194cd3587ad6805e1e5a95ca9b76800a07bf1b9729e5' 
  AND token = '82eiDXV4+kx7sDVMeHyQ1xRUCU1WA1Wuuz1ytpWFsP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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