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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833754b713973cae23e8f7ba17038eae2608109c92834c45c0d3c3e0219e5626' 
  AND token = 'gYiH15qsnUsj1ho2kM89A4s3KPzBETsLtWyYv2456i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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