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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99cce1943d2edca572f47e797709a7f440954c455a6f5f646c4c197f7ae7d61' 
  AND token = 'QXHYKWnrP4kviTTycm73v2dWllMtSTdbqL99Jl/8ZUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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