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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478f40ac07973b6cd72146143ceb288f2c7631c676d53da60eba65be652b6e2e' 
  AND token = '30WUY0PA/E72t7yfgSoR9QWLWhlrBusI7fk1okSieF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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