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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9cbc0461fc9e6cd53b2c17ade082554137c95402b31ee873dfc377342eff55' 
  AND token = 'aExDL7IBuRYSUiJxB1+xUrYrjhjzg6m1FSutd7bCQJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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