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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219ccd0c4951ee064ee1f3fd279fba370bbee196b51d2e56edde65a515a038ca' 
  AND token = 'kWIz+bg67E5j6QC0YIZAlwJHnkvTbcqnUynyfKwMKyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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