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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce2626eb057843eb0ae8f5ce18ffc2c617c59846abd5787bb7a6711b648809d' 
  AND token = 'U9yMlkMDdsAtu8aVDGHgM38B7QcKMilOcplKUY0kHZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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