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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31243e0fad6af0db72c38864558f1d32b3931628ac82d25cac834203d9a0791e' 
  AND token = 'EMCTLbPxs4ObwvWDb+Q7iF/lh6iR7bWOCkRBF6ZgYtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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