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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594f962e9a78c6c56cd15a19b7658e44ec5bf4054d291c78a2a6bf3e9ba6e38c' 
  AND token = 'Ogu1sRm2W0joGOyXM6Gk/fAWCbFGW8F2Kegb18ineFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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