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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee0b616fb21591e5e964b77c6f074755fac1457747ce84185378c63ddcf09b2' 
  AND token = 'aIffhw6h9Ro9LaDqAxVBfP+qI3mgzqwPyzQFzsgey4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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