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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9334aa9dfef9574393b67207f261c8732618b5276167ff4545420d486161c3a7' 
  AND token = 'zWZmuEu2j11ikRo5/9R5IgPIO8LJmpSH3oj9t0D9kAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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