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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea424765eccc235060988733b85931a16ce29a26c9a929f13d54bd5f9bdb7e1' 
  AND token = 'XPpoeB+cKMD2mk5NAB3e2lFf7gprFGwfbjN29hHpKzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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