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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca718de084636ce7c8d305e3bcec83d695fc717449f975ffd6d75cb4dbcf1e7' 
  AND token = 'tM1sG9ZDn4VmxnAhdsSJgg6g/Su9hoZ8cgFyjCZlqf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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