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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629030f6c2c96130b8f8a14254295b6baa9a00f06abd920ae9be0fd35f197e5b' 
  AND token = '1JKiYW8/1RF+IKqO9xehs4oD/futeesjPhVNVWMKHOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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