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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cf03003db7b10c41b76438a85ddd386ec5057424896cc4fe5a0f402a301ca2' 
  AND token = 'dyKyrGxzcg5D4Bigri0lSlsvmtWoiyHRNNZNV8537ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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