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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3188fc5aa83ea7b18ae6d4eb2916905ded2d181901d9d7380c6d892f3e69bf' 
  AND token = '7JJppdLCw7giiy9j+tjlgzCLFRqlE8lKVNUaMUFyDNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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