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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196190309c3729af0fda4321be42ae85cdb5640d732b56c572716922711a0ac7' 
  AND token = '1U2WtCLMiQu8YWYAE60XECVrf1MIhhKZqSikH/OBddg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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