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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1968ec28b31246e9165645a5191905bebdd807c1b0c7f8944c605b96d0154155' 
  AND token = '1qMz3XsDmBzOjl6p4gtzGUNgb4vYPT6UfZs0iGj+ctE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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