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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9aaee88172efdb255c90b62dc49e89b138d549e77bf6e3af14d9d6bc9ab18c' 
  AND token = '2AWuENkHXl81ax8o0z0FA/2oXV00Dc2Algbhky4CPT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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