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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6b8510768c595405d0ed4f7aa009780087be9d04dac2b0002e736ae61fbf4d' 
  AND token = 'vh/sIVN+9F6E4anNoQLFQ0xewahK+/Se1rpwX8m9U24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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