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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbef2a65c363e4d15fb099a4baf59ee0672c7b81f3f2c953172dfb3b1239c38' 
  AND token = 'sk5X057ZY2HJ8dRK84fgBUoE3j5ZWUIO0RhHkebMOVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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