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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4867c6bcef4d9b63c7f9514d6e21c05ee22151e2bf04581391c80dfafef6a494' 
  AND token = 'ILSwL2+peAe+Pv5FGTUJSsXQFYUBX+An5CTr4U6b4tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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