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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1d46c5fd008ba30102f0bf01f29f39e53b5b1085f1b0d355bfcb1f8532beb9' 
  AND token = 'xXdUCFMUo7KhXxI62ypU7A1txkJc8qpqBBKhRk2GOeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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