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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0322a8d11e0adedad924c4b39e9084591693dcc85d6a07cc9ec4afe8919177' 
  AND token = 'giV8uFP7/a+1riQJEPzyUskIoG6zSi/1CMFbuS+/3nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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