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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29331727b9a2fd1753ec6b5cd080fbe84d13dc8fa4bc1ca06bcf122243b363c' 
  AND token = 'NkenLwWGaPcXfEFgIT+4DKHBJ2Lq/QstZiD5osD3Is4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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