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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f546b17f9452428dd824c7d91974d5bdba8b61c935b5a7f7bbfdef6e944c4528' 
  AND token = 'ipjC7FH+pEDUdA137QgiihzAo4HFi/PUxTy8YcXB2XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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