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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae9dc51a67e9c5f68bda30cb94296018d9386ba7c6f6a6c4967c09a0b35ff6e' 
  AND token = 'JqGv0fJ5+a/qkmHMXHMaA+zdfxN/hEARBvqCfLODR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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