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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd211646d49a56deb28da14a329ddb240f9b78ac8e7ed53ec1c1f0daf0bf397c3' 
  AND token = 'eaYCH4ilRmMvQ66md0TY5QI6c9GSL74dycnI9B5t1vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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