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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bea4b5b2a3fbb16a08498e90cc42762a06e743465868efe08751126225cdeab' 
  AND token = 'VysPxkMSEUN69YKbcUbXyRN+iAFhy4Fq+Pp2PR3/l50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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