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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ede3d07672f5d6b22423b92b78c35887319ea8f99f12e45063732708a538086' 
  AND token = 'tnC2L1SAV0Xsv5kKQTzf3J/Zxm+y7EWsrS1NE+10Ihs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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