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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7f8158fe87d1e8978bb38b856570cf54489fe38bff5187563cba7c60787cde' 
  AND token = 'TmjeisxLmOt81RGhzFov6P/9x325vF3Rl9AO9d9x0F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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