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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bcc7230fb7aa1be3dea281a346f84d7dadbc5a1092289bb8d53041bcc8e14d' 
  AND token = 'aMhChcW+InbDvbAEZEMw/T3Rg11Z4GTp+xiUjpEExqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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