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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5083657af1027db23fe91d89cf5e40a064453489c9b3c60630d60c7186071c0' 
  AND token = 'FtNJoXbopOVabsx8J356Cjt+GKUehcwzL/+kh46cR/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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