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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a549fe6a5a26baabfcd2052c2e3b592ff1a7f91c59425f47fa708d67c652696c' 
  AND token = 'sv+/094yTdMHjOgwwrMXbiM5Sdsikk0GL6gyw0VYxSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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