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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee56b69a3ded39624f8ae83344c2350686300f1038985d9709b1de1dfbbc1a6' 
  AND token = '5xZJXmJMUcT6L6n8b13GkKDx2Mxwa90EY4z5bA+VePM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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