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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37173420b0aa4b9a2db6dd90b61c8d719caa010302482fcf93c1290280bdba4' 
  AND token = 'SGnl/rtBnRekuNikX0wj8nbeVEBP34D/tqRef3St6rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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