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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82aefeb6086df9e21cbd3e4ee46ecb6a410ff34ee3f958e0961e54c4b772087b' 
  AND token = 'I2YrbNYYf6Ombyb8ZS72lI4nIVizaT2WyuRcPRQ6Wy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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