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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a5e86a089f76a7fbd1758338a8ed43ec684245f756da6c3892e5ca8ad29b8f' 
  AND token = 'rl9YvOsABW1eM8HhiNaxCYH/tfr80Ghkm/UDRD483+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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