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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da240e09afcae8537cc2202f3d0041acfce1323ca7a6ff9c6820e95c3a089b1' 
  AND token = 'a5CSWIessMYY4cy8SCG6OWcXozVmcjtWxfz4tBK8ikc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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