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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b2913f218607c1ae4df0f8e6b76f6501d171108e6771693bbbee21c2cb7598' 
  AND token = 'iYagdnKkfogDHSq4Szw999GsbJhnDLa9+QYXCkQm7t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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