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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e96737d1707c3981cb48e9d55978ed9db74bde3cd2e24b99e50ac1dfe6d45f9' 
  AND token = 'F0mLtwkftNwOfqUP9u5RQ5EutU0D0FqKE2f3496G16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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