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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06e311b37111dd95e4e6c0b61f331b97cae7cd7030dfd7fc2136d834965e73c' 
  AND token = 'yT3mRV7CfOAELU/jwYdumAz+TI+YjCJdeW8JTf/U/C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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