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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac352e2c25e150a5901b5c02a65a5adeebcd462f3d66469f0c892117ea3bd9e' 
  AND token = 'bSNC4ZuOvXg630zEIHCmaW4tYfP79SVcxEMDqAz2G1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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