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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18092753b54311f6cc30de9bdcab441090c90fdcd3bddf96d04bfa8e482ada8d' 
  AND token = 'JB3u/enW2ArgF3lnBViiEstNEWgy+DY61wPc1uj3sfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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