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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652af14433d63a3b57d431723d23a80ac3246aeb8eac4bb1e4caab2e37d6ccd1' 
  AND token = 'J8YdjZgPvGqx7RhEXEb8R39Br4IV5H7MRwgFTQLFXqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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