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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabd8ed8e7eb917cb8a9fd07ba46bcd46da725b7de0adc789c9ca9aab77568bb' 
  AND token = '0FmzK7QkW7lGM8+LPDXE4ERtFVhITKZdklXasTSmTwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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