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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc79e288d8927f92169cd337a19243f7c0e03f702e010b7fe31d0277e65652d' 
  AND token = 'N4hMk21nCqaOq5xnyVP0Cg0raZ7sosyG5kViHwfQrmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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