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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d8e0bb73ac7e04853784f24f41e5d279efd22e320d7cca98ddcde4ea31449a' 
  AND token = 'CjNQ/5sKctkRv2O5i2gY+v18UkWlW8FjS1qgBE/usAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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