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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b22c5afb319972bfc84ca212088809b7236fce227e96768281717b336ec5cac' 
  AND token = 'OFOrdRW9Q2HiR01FchPR6WP+e8/IYFX3OS416/rPowU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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