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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70e711fcdfdbfd7304d0c07dcc5160600f34d5239f6f43397e4b1fce2ce20f9' 
  AND token = 'GJ62uxzA4KGusPXU9/Icr6uIUca4TwhN0slZ8HP2mjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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