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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf64a6a67e23a3cb9a3cad5392728e379c9e696ea21109e15ddfee696ab072c' 
  AND token = '9eqX+DiMV+sNBek/CBb7dN/cyEPMd9BWFdxsLj7fNCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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