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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6f0995cb9ec10041ef43bb1426cc1e404cbd244f38ef5e972d1f8f7e1d06d4' 
  AND token = 'gMU4PhJpJ/C68+yaV5iNGA0aHKJ8DZBUScT3kXezMd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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