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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f57a65174d6fe8ea43b1391418b219c51218f15fb800bd3d743f317927b6628' 
  AND token = 'aCo0wg7uxMp3FElrRvMLEZ0ZynTZkwY0tsFWzSKHzN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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