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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc70a176f3d866390e1d25a884de33d4fa65af7f55713f781539d8284ac32fd4' 
  AND token = '8/ll+HOxS393ERQhmnx8MNgsych56ucWvd0wDAszo5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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