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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0983b6086a95056ad50cfb90721d1cb88bc58471fe327b42221b6d3e2c6b56' 
  AND token = 's9S2myecIXOVkJe3ttsGkZ0/tZBJlX0QvcIVth6/Pnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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