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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1553e28dd06bda2fe5b19c5c054d8afb0f23695686068b0000b6b4ad03f9e8' 
  AND token = '0lz2J2UEExYedwf7EIur+6PkvWvUyDrsJdxwOPS1D9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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