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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c984ba9e86d50c7e94d578ae8ffe319b45f7c06770accce7d06c994792de89d9' 
  AND token = 'g0H2sDzhcbqx3rpkFLVAj5+1RQjrbki2lUMAXh5Wglw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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