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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ccada4425a335d0896ef8477543fad007807ade00660dbb36235b74971d0bd' 
  AND token = 'Xn5xRyMTY7CxtaptuPOYAdf30IbzdUJhePRyAoEK3+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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