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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae84e4bf3564e93f846789c1f2b7fec8e62fe597180860ea1ec396adbcb29ea3' 
  AND token = 'WSNoid79jVdiry6BaUeGID1T1SXn25FacsRK7tME0/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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