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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e532d63141d99af4ffe73cb95f26f5d047ffeeb381309522414cc279ac6796' 
  AND token = 'yjw/4ROFG59J2t833++fyhE11lX3+XNRY+LOK2GCbiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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