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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c724c38a4a1d5110bb55996b0d21afde7a18e60a340d25e0eeea665c900f8b' 
  AND token = 'u755OM6AhhKroaMME1ZOkCJcuMc/WLbwsc3WZ15pkJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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