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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2fdc2c9733aafa5f4d7429af354c3b3d85c78d99fb1bbef52a7e16a6992b68' 
  AND token = 'YmGx2qBZeShGsissTBN8mJYxcGhxecR37SSkM9/4ASE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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