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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4028d183914c0e0ac59a33f84b8ed2456f202b54187e47a1db457325c07674a4' 
  AND token = 'TA1nYUvOV9jCjiElTyY4uWS5eh9O8wpHI1EQ/HhQvGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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